PurpleDiamond, I don't think anyone was inferring that aliens can live on stars. I ould imagine that it's widely accepted that that wouldn't be possible, especially since there is no surface on the sun dense enough to settle on.

And as to your remark about Pluto, I'm not really sure what to make of it. We've taken pictures of the surface, but that statement is the same as saying "When we've sent spacecraft out to space and taken pictures of Earth, we couldn't see any civilzations. Therefore, none must exist."

http://ohmygov.com/blogs/general_new...eWestTerra.jpg

I don't know about you, but I don't see any signs of civilization in that picture. AND that picture is taken from a much closer distance than any picture we've taken of Pluto.